Red cotton-dye and process of making same.



Nrrnn STATES PATENT FFICE.

ERNST WINTER, OF HOCHST-ON-THE-MAIN, GERMANY, ASSIGNOR TO -FARBWERKE, VORM. MEISTER, LUCIUS dtBRUNING, OF HOOHST- ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

RED COTTON-DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 697,765, dated April 15, 1902.

Application filed August 3, 1901.

In this formula X means the radical of an amin of the benzene series. By combining these asymmetric thio-ureas with diazo compounds the new dyestulfs are obtained,which from their construction have the following wherein X means the radical of an amin of the benzene series, Y the radical of a diazo compound, for instance, of anilin, of its homologues, of anisidin, of para-amidoacetanilid.

The new dyestuffs are brown-red powders, soluble in water to a red solution, directly dyeing cotton red shades, the dyeings being characterized by their fastness to acids.

I illustrate my process by the following example: 37 .9 kilos of thio-urea, obtained from 2.5.7-amidonaphtholsulfonic acid and phenylmustard oil, are dissolved in water, to which are added twenty kilos of sodium carbonate,

Serial No. 70,752. (Specimens) whereupon a diazo solution is gradually run in, which is prepared in the usual manner from fifteen kilos of para-amidoacetanilid, twenty-five kilos of hydrochloric acid, and 6. 9 kilos of nitrite. The dyestulf is formed at once and partly separates from the solution. On addition of common salt a complete separation is produced, and the dyestuff is obtained by filtration and drying as and powder of green luster, which is soluble in water to a red solution, dyeing unmordanted cotton red. The aqueous solution becomes blue-red on addition of mineral acid and yellow-red on adding alkali. The dyestuff is little solu= ble in alcohol and insoluble in petroleum ether. the dyestuif with a blue-red color.

Having now described my invention, what I claim is- 1. The herein described process for the manufacture of dyestuffs for cotton, which consists in combining asymmetric thio-ureas, obtained by the action of aromatic mustardoils on 2. 5.7-amidonaphtho1sulfonic acid with diazo compounds, substantially as set forth.

2. The herein described process for the manufacture of a dyestuff for cotton, which consists in combining asymmetric thio-ureas obtained by the combination of an aromatic mustard-oil with 2.5.7-amidonaphtholsulfonic acid with the diazo compound of para-amideacetanilid, substantially as set forth.

3. As new products, the dyestuffs having the general formula:

wherein Y is the radical of a diazo compound, X the radical of an amin of the benzene series, being brown-red powders soluble in water and which directly dye cotton red shades fast to acids.

el. As a new product, the dyestuff obtained Concentrated sulfuric acid dissolves by the action of diazotized para-amidoacetanilid on thio-ureas of the formula:

10 wherein X means the radical of an amin of the benzene series, being a brown-red powder of metallic luster soluble in water to a red solution becoming blue-red on addition of ERNST WINTER! Witnesses ALFRED BRIsBoIs, HEINRICH HAHN. 

